I took an oath that he should quietly reign

York 
I took an oath that he should quietly reign.
Edward 
But for a kingdom any oath may be broken.
I would break a thousand oaths to reign one year.
Richard 
No, God forbid your Grace should be forsworn.

Therefore, to arms! And, father, do but think
How sweet a thing it is to wear a crown,
Within whose circuit is Elysium
And all that poets feign of bliss and joy.

York
I shall be, if I claim by open war.
Richard
I'll prove the contrary, if you'll hear me speak.
York
Thou canst not, son; it is impossible.
Richard
An oath is of no moment, being not took
Before a true and lawful magistrate
That hath authority over him that swears.
Henry had none, but did usurp the place.
Then, seeing 'twas he that made you to depose,
Your oath, my lord, is vain and frivolous.
Therefore, to arms! And, father, do but think
How sweet a thing it is to wear a crown,
Within whose circuit is Elysium
And all that poets feign of bliss and joy.
Why do we linger thus? I cannot rest
Until the white rose that I wear be dyed
Even in the lukewarm blood of Henry's heart.
York
Richard, enough. I will be king or die.—
Brother, thou shalt to London presently,
And whet on Warwick to this enterprise.—
Thou, Richard, shalt to the Duke of Norfolk
And tell him privily of our intent.—
You, Edward, shall unto my Lord Cobham,
With whom the Kentishmen will willingly rise;
In them I trust, for they are soldiers
Witty, courteous, liberal, full of spirit.
While you are thus employed, what resteth more
But that I seek occasion how to rise,
And yet the King not privy to my drift,
Nor any of the house of Lancaster.